Fig. 12. Local electric potential differences (i.e., between adjacent electrodes) for the NaCl diffusion experiment. (a) Measurements at z = 5 cm; (b) measurements at z = 11 cm (see Fig. 3); (c) one-dimensional modeling for an effective diffusion coefficient equal to twice the molecular diffusion coefficient; (d) One-dimensional modeling for an effective diffusion coefficient equal to the molecular diffusion coefficient.